VulnerabilityModified
CVE-2021-26910
Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.
HIGH 7.0EPSS 0.44%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.44% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-367
- Affected
- firejail project/firejail · debian/debian linux
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2021/02/09/1Exploit, Mailing List, Patch, Third Party Advisory
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bPatch, Third Party Advisory
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00015.htmlThird Party Advisory
- https://security.gentoo.org/glsa/202105-19Third Party Advisory
- https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/Exploit, Third Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploit, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4849Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/02/09/1Exploit, Mailing List, Patch, Third Party Advisory
- https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bPatch, Third Party Advisory
- https://github.com/netblue30/firejail/releases/tag/0.9.64.4Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00015.htmlThird Party Advisory
- https://security.gentoo.org/glsa/202105-19Third Party Advisory
- https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/Exploit, Third Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtExploit, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4849Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.